Just after midnight, Washington legalized possession of up to an ounce of marijuana for recreational use for those over 21 under Initiative 502, which took effect Thursday, Dec. 6. 2012. A public celebration hailed as Legalization Day in Washington State attracted about a hundred people to toke up at Seattle Center’s International Fountain Thursday evening, after a similar event at 12:01 a.m. near the Space Needle. Public smoking is still against the law, and marijuana remains counter to federal law. Colorado passed a similar measure.